Valve.



No. 779,786. PATENTED JAN. 10, 1905.

W. H. KILBOURN.

VALVE. 7 APPLICATION FILED FEB. 11. 1904.

m cm I wwww UNITED STATES Patented January 10, 1905.

PATENT OFFICE.

VALVE.

SPECIFICATION forming part of Letters Patent No. 779,786, dated January10, 1905.

' Application filed February 11, 1904. Serial No. 193,137.

To all whom it may concern:

Be it known that 1. WASHINGTON H. KIL- BOURN, of Greenfield, in thecounty of F ranklin and State of Massachusetts, have invented certainnew and useful Improvements'in Valves, of which the following is aspecification.

This invention has for its object to provide a valve to control thepassage of water, steam, or other fluid and comprising a casing and amovable valve-piece therein, the'valve-piece being adapted to be held inclose contact with the casing and maintain a tight joint by the pressureof the incoming fluid, so that no springs, packing, &c., are required.

The invention consists in the improvements which I will now proceed todescribe and claim.

Of the accompanying drawings, forming a part of this specification,Figure 1 represents a longitudinal section of a valve embodying myinvention, the valve-piece being shown in elevation and in its closedposition. Fig. 2 represents a view similar to Fig. 1, showing the valvein its opened position. Fig. 3 represents a section on line 3 3 ofFig. 1. Fig. 4 represents a section on line A 4 of Fig. 2. Fig. 5represents a section on line 5 5 of Fig. 1. Fig. 6 represents a sectionon line 6 6 of Fig. 2-.

The same reference characters indicate the same parts in all thefigures.

In the drawings, (0 represents a valve-casing which is of angular formand has an inlet branch a and an outlet branch (0 The casing has also anend or head a at the opposite side of the outlet branch from the inletbranch.

brepresents a cylindrical valve-piece which is fitted to rotate in thecasing a and. has an end 7), formed to bear against the head (0 of thecasing, and an oblique or beveled end 72 the inclination of which issuch that when the end I) bears against the head of the casing and thevalve-piece is adjusted, as shown in Figs. 1 and 3, one side of thevalve will cover the outlet branch a and the oblique face 6 will bepresented to the incoming fluid through the inlet branch (0. When thevalve is turned to the position shown in Figs. 2 and 4, the

oblique face 6 overhangs the outlet branch a so that there is a freepassage through the casing.

It will be seen by reference to Figs. 1 and 2 that the oblique face 6forms one side of a tapering space communicating with the inlet, theopposite side of said space being formed wholly by the casing. The fluidpressure against the face 5 is therefore exerted both sidewise andendwise of the valve and is at all times exerted on the said face insuch direction as to hold the peripheral portion of the longer side ofthe valve against the casing and the end 5 of the valve against the heada of the casing. Hence when the valve-piece is in the position shown inFig. 1 the pressure at the inlet side of the casing maintains a tightjoint between the periphery of the valve-piece and the portion of thecasing surrounding the outlet branch and also a tight joint between theend 6 of the valve-piece and the head a of the valve. When thevalve-piece is in the position shown in Fig. 2, the pressure on theoblique face 6 while reduced, owing to the fact that there is a freeoutlet through the outlet branch a is still sufficient to hold the end 6of the valve against the head of the casing. A tight joint is thusmaintained both between the valve and the outlet branch when the valveis closed and between the valve-stem 6 and the orifice in the head (4through which said stem passes. This improved valve does not require theuse of packing material, springs, or other adjuncts to maintain a tightjoint at the outlet and around the valve-stem.

To assist the fluid-pressure in maintaining a tight joint around theoutlet branch and at the end or head of the casing, I provide thevalve-piece b with a groove 6, which extends partly around the peripheryof the valve-piece and is curved or cam-shaped at one end, as shown atZ), one of its end portions decreasing in depth. as shown at b in Figs.5 and 6. With this groove cooperates a stud or screw 6 engaged with thecasing and entering the groove. The arrangement of the groove is suchthat when the valve is open the screw will occupy the deeper centralportion of the groove If. When the valve is closed, the

screw will come to a bearing on the shallower portion 5 of the groove,as shown in Fig. 5, and thus exert pressure on the valve tending toforce its periphery against the seat surrounding the outlet a thispressure being relieved when the valve is open. The grooved end 5" ofthe groove is arranged to cooperate with the screw in forcing the valveendwise against the head a when the valve is in its closed position.

I claim 1, A valve comprising a casing having an inlet, a head, and anoutlet between the inlet and the head, and a rotary valve-piece formedto be held against the head and against one side of the casing byfluid-pressure at the inlet side and formed also to open the outlet whenturned to one position and to close the outlet when turned to anotherposition, and means operated by movements of the valvepiece forincreasing the end pressure of the outlet when turned to anotherposition, the

said valve-piece having a groove which receives a stud on the casing,the groove being of varying depth and having a cam-shaped wall.

In testimony whereof I have affixed my signature in presence of twowitnesses.

lVASHINGTON H. KILBOURN.

WVitnesses:

C. F. BROWN, E. BATCHELDER.

